Bug report

Describe the bug
Javadoc fails at being generated because of the usage of emoji on window-latest.

How we reproduce the bug
Steps to reproduce the behaviour:

1. Add steps to test_pack_doc to run job doc on window-latest.

Expected behaviour
No error message and artifacts should be persisted for window-latest.

Observed behaviour
An error regarding the encoding is triggered:

> Task :main:javadoc FAILED
D:\a\gtfs-validator\gtfs-validator\main\src\main\java\org\mobilitydata\gtfsvalidator\cli\Main.java:197: error: unmappable character (0x8F) for encoding windows-1252
          "⚠�? Note that parameters marked with an asterisk (*) in the help menu are mandatory.");
                ^
1 error

FAILURE: Build failed with an exception.

Environment versions

• validator version: v3.0.0
• Java version: GitHub Action (see this branch)
• OS versions: GitHub Action (see this branch)